HI - Not a scam BUT - if you are hosting yourself you will need to purchase a power supply - which will cost $300-400. Personally - to me that price seems of 1.5 BTC - SEEMS VERY LOW -- I just purchased FOUR for those machines for $2k each, without power supply.  You can overclock them to 200GH which I would recommend - they work fine.  Oh, You can fit only 2 of these of ONE power supply .. Just FYI -- My only advice is to ask how they can possibly sell them at that price, too low in my opinion by about $500.